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Stockholders' Equity - Monthly Distributions Declared and Paid by Company's Board of Directors (Detail) (USD $) | 3 Months Ended | 0 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Feb. 03, 2015 | Jan. 31, 2014 | Feb. 27, 2015 | Feb. 28, 2014 | Mar. 31, 2015 | Mar. 31, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Distributions per Common Share | $ 0.105 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.090 us-gaap_CommonStockDividendsPerShareCashPaid |  |  |  |  |  |
Monthly Distribution One [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Dividend Declaration Date | Jan. 13, 2015 | Jan. 07, 2014 |  |  |  |  |  |
Record Date | Jan. 23, 2015 | Jan. 22, 2014 |  |  |  |  |  |
Dividend Payment Date | Feb. 03, 2015 | Jan. 31, 2014 |  |  |  |  |  |
Distributions per Common Share |  |  | $ 0.035 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = land_MonthlyDistributionOneMember | $ 0.030 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = land_MonthlyDistributionOneMember |  |  |  |
Monthly Distribution Two [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Dividend Declaration Date | Jan. 13, 2015 | Jan. 07, 2014 |  |  |  |  |  |
Record Date | Feb. 18, 2015 | Feb. 19, 2014 |  |  |  |  |  |
Dividend Payment Date | Feb. 27, 2015 | Feb. 28, 2014 |  |  |  |  |  |
Distributions per Common Share |  |  |  |  | $ 0.035 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = land_MonthlyDistributionTwoMember | $ 0.030 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = land_MonthlyDistributionTwoMember |  |
Monthly Distribution Three [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Dividend Declaration Date | Jan. 13, 2015 | Jan. 07, 2014 |  |  |  |  |  |
Record Date | Mar. 20, 2015 | Mar. 17, 2014 |  |  |  |  |  |
Dividend Payment Date | Mar. 31, 2015 | Mar. 31, 2014 |  |  |  |  |  |
Distributions per Common Share |  |  |  |  |  |  | $ 0.035 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = land_MonthlyDistributionThreeMember | $ 0.030 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = land_MonthlyDistributionThreeMember

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Date the dividend to be paid was declared, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
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